Inductive load actuating circuit using higher current levels...

Details Inductive load actuating circuit using higher current levels... Inductive load actuating circuit using higher current levels...

H - Electricity

01

H

318/5

H01H 47/32 (2006.01)

Patent

CA 1147015

ABSTRACT Comparator means respond to the current levels through an inductive load to generate HIGH and LOW level outputs causing first switch means to connect and dis- connect power to the load. When the load current initially exceeds a peak load actuation level flip-flop means responsive to the corresponding change In comparator output levels change the current through an auxilliary sense resistor coupled to the sense input of the com- parator means. In one embodiment a one-shot multi- vibarator prevents a change in the current to the auxil- liary sense resistor for a fixed period after the com- mencement of a load actuation signal. The subseguent HIGH end LOW comparator output levels are fed back to the comparator reference input to switch the reference voltage thereat so as to represent first and second levels of the current sufficient to maintain actuation of the load.

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